* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

nav {
    background: rgba(255, 255, 255, 0.95);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav h1 {
    color: #667eea;
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-links a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background: #667eea;
    color: white;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.card h1, .card h2 {
    color: #333;
    margin-bottom: 1.5rem;
    text-align: center;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s ease;
    width: 100%;
}

.btn:hover {
    transform: translateY(-2px);
}

.logout-btn {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
}

.error {
    color: #ff6b6b;
    margin-top: 1rem;
    text-align: center;
}

.success {
    color: #4ecdc4;
    margin-top: 1rem;
    text-align: center;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.balance-card {
    background: linear-gradient(135deg, #4ecdc4 0%, #44a08d 100%);
    color: white;
}

.income-card {
    background: linear-gradient(135deg, #45b7d1 0%, #96c93d 100%);
    color: white;
}

.expense-card {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.balance-card h2,
.income-card h2,
.expense-card h2 {
    color: white;
    text-align: center;
    margin-bottom: 1rem;
}

.balance-card p,
.income-card p,
.expense-card p {
    font-size: 2rem;
    font-weight: bold;
    text-align: center;
}

.recent-transactions h2 {
    text-align: center;
    margin-bottom: 1rem;
    color: white;
}

.recent-transactions {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 1.5rem;
}

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: white;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.transaction-item.income {
    border-left: 5px solid #4ecdc4;
}

.transaction-item.expense {
    border-left: 5px solid #f5576c;
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filters input,
.filters select {
    flex: 1;
    min-width: 150px;
}

.record-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: white;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.record-item .delete-btn {
    background: #ff6b6b;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.record-item .delete-btn:hover {
    background: #ee5a52;
}

.profile-info p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        justify-content: center;
    }

    .container {
        padding: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .dashboard-cards {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
    }

    .filters input,
    .filters select {
        min-width: auto;
    }
}